[R] question!!

hi!! imade many codes during these days..
I study Statistics....
please one more question!!
ex1<-function(n,p,rho){
muvec1=zeros(1,p)
A=eye(p)
for(i in 1:p){
for(j in 1:p){
A[i,j]=rho^(abs(i-j))
X=mvrnorm(n,muvec1,A)}}
return(X)
}
this code generates design matrix in linare regression model..
but this code only one data set..
Is there any method to generate several data sets(design Matrix)??(in R
program)
please give me help..
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